So I have a Vox AC15C1 TV Blue - one of those from last year's sale - and it came with a Greenback, which sounded pretty good. I had always planned on getting a Celestion Blue, and I finally got one after my Mesa 2x12 "needed" a greenback. So I got the Blue today, and... it doesn't fit! The tubes bump into the back of the speaker. I guess this TV version just cannot accomodate it, or am I missing something? I just put it into a 1x12 cab for now, and it really does sound glorious, so I'm not too worried about it, but I would prefer to have it in the combo. I have another 16 ohm greenback clone speaker I can throw into the Vox, so it's all good, but is there any way to change this? It bumps into a power tube and a preamp tube, and it displaces them by about a centimeter. Any input is appreciated - I just find this surprising since Voxes are kind of known for using Blues.